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datetime="2024-02-02T14:59:51.389Z" title="更新于 2024-02-02 22:59:51">2024-02-02</time></span><span class="post-meta-categories"><span class="post-meta-separator">|</span><i class="fas fa-inbox fa-fw post-meta-icon"></i><a class="post-meta-categories" href="/categories/%E6%8A%80%E6%9C%AF%E6%95%99%E7%A8%8B/">技术教程</a><i class="fas fa-angle-right post-meta-separator"></i><i class="fas fa-inbox fa-fw post-meta-icon"></i><a class="post-meta-categories" href="/categories/%E6%8A%80%E6%9C%AF%E6%95%99%E7%A8%8B/mall/">mall</a><i class="fas fa-angle-right post-meta-separator"></i><i class="fas fa-inbox fa-fw post-meta-icon"></i><a class="post-meta-categories" href="/categories/%E6%8A%80%E6%9C%AF%E6%95%99%E7%A8%8B/mall/%E6%8A%80%E6%9C%AF%E8%A6%81%E7%82%B9%E7%AF%87/">技术要点篇</a></span></div><div class="meta-secondline"><span class="post-meta-separator">|</span><span class="post-meta-wordcount"><i class="far fa-file-word fa-fw post-meta-icon"></i><span class="post-meta-label">字数总计:</span><span class="word-count">908</span><span class="post-meta-separator">|</span><i class="far fa-clock fa-fw post-meta-icon"></i><span class="post-meta-label">阅读时长:</span><span>3分钟</span></span><span class="post-meta-separator">|</span><span class="post-meta-pv-cv" id="" data-flag-title="前后端分离项目，如何解决跨域问题"><i class="far fa-eye fa-fw post-meta-icon"></i><span class="post-meta-label">阅读量:</span><span id="busuanzi_value_page_pv"><i class="fa-solid fa-spinner fa-spin"></i></span></span></div></div></div><article class="post-content" id="article-container"><blockquote>
<p>跨域资源共享（CORS）是前后端分离项目很常见的问题，本文主要介绍当 SpringBoot 应用整合 SpringSecurity 以后如何解决该问题。</p>
</blockquote>
<h2 id="👍-相关视频教程"><a href="#👍-相关视频教程" class="headerlink" title="# 👍 相关视频教程"></a><a target="_blank" rel="noopener" href="https://www.macrozheng.com/mall/technology/springboot_cors.html#%F0%9F%91%8D-%E7%9B%B8%E5%85%B3%E8%A7%86%E9%A2%91%E6%95%99%E7%A8%8B">#</a> 👍 相关视频教程</h2><p><a target="_blank" rel="noopener" href="https://t.zsxq.com/0ee5PLpZj">前后端分离项目解决跨域问题open in new window</a></p>
<h2 id="什么是跨域问题"><a href="#什么是跨域问题" class="headerlink" title="# 什么是跨域问题"></a><a target="_blank" rel="noopener" href="https://www.macrozheng.com/mall/technology/springboot_cors.html#%E4%BB%80%E4%B9%88%E6%98%AF%E8%B7%A8%E5%9F%9F%E9%97%AE%E9%A2%98">#</a> 什么是跨域问题</h2><p>CORS 全称 Cross-Origin Resource Sharing，意为跨域资源共享。当一个资源去访问另一个不同域名或者同域名不同端口的资源时，就会发出跨域请求。如果此时另一个资源不允许其进行跨域资源访问，那么访问的那个资源就会遇到跨域问题。</p>
<h2 id="跨域问题演示及解决"><a href="#跨域问题演示及解决" class="headerlink" title="# 跨域问题演示及解决"></a><a target="_blank" rel="noopener" href="https://www.macrozheng.com/mall/technology/springboot_cors.html#%E8%B7%A8%E5%9F%9F%E9%97%AE%E9%A2%98%E6%BC%94%E7%A4%BA%E5%8F%8A%E8%A7%A3%E5%86%B3">#</a> 跨域问题演示及解决</h2><blockquote>
<p>我们使用 mall 项目的源代码来演示一下跨域问题。此时前端代码运行在 8090 端口上，后端代码运行在 8080 端口上，由于其域名都是 localhost，但是前端和后端运行端口不一致，此时前端访问后端接口时，就会产生跨域问题。</p>
</blockquote>
<h3 id="点击前端登录按钮"><a href="#点击前端登录按钮" class="headerlink" title="# 点击前端登录按钮"></a><a target="_blank" rel="noopener" href="https://www.macrozheng.com/mall/technology/springboot_cors.html#%E7%82%B9%E5%87%BB%E5%89%8D%E7%AB%AF%E7%99%BB%E5%BD%95%E6%8C%89%E9%92%AE">#</a> 点击前端登录按钮</h3><blockquote>
<p>此时发现调用登录接口时出现跨域问题。</p>
</blockquote>
<p><img src="https://qiniu.ko25891wan.top/%E6%97%A5%E8%AE%B0%E8%BD%AF%E4%BB%B6/obsition/2024-02-02_22:56:27_tech_screen_35-a5cdc125.png"> <img src="https://qiniu.ko25891wan.top/%E6%97%A5%E8%AE%B0%E8%BD%AF%E4%BB%B6/obsition/2024-02-02_22:56:27_tech_screen_28-c25fccf6.png"> <img src="https://qiniu.ko25891wan.top/%E6%97%A5%E8%AE%B0%E8%BD%AF%E4%BB%B6/obsition/2024-02-02_22:56:27_tech_screen_29-ab3cc70d.png"></p>
<h3 id="覆盖默认的-CorsFilter-来解决该问题"><a href="#覆盖默认的-CorsFilter-来解决该问题" class="headerlink" title="# 覆盖默认的 CorsFilter 来解决该问题"></a><a target="_blank" rel="noopener" href="https://www.macrozheng.com/mall/technology/springboot_cors.html#%E8%A6%86%E7%9B%96%E9%BB%98%E8%AE%A4%E7%9A%84corsfilter%E6%9D%A5%E8%A7%A3%E5%86%B3%E8%AF%A5%E9%97%AE%E9%A2%98">#</a> 覆盖默认的 CorsFilter 来解决该问题</h3><blockquote>
<p>添加 GlobalCorsConfig 配置文件来允许跨域访问。</p>
</blockquote>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br></pre></td><td class="code"><pre><span class="line">package com.macro.mall.config;</span><br><span class="line"></span><br><span class="line">import org.springframework.context.annotation.Bean;</span><br><span class="line">import org.springframework.context.annotation.Configuration;</span><br><span class="line">import org.springframework.web.cors.CorsConfiguration;</span><br><span class="line">import org.springframework.web.cors.UrlBasedCorsConfigurationSource;</span><br><span class="line">import org.springframework.web.filter.CorsFilter;</span><br><span class="line"></span><br><span class="line">/**</span><br><span class="line"> * 全局跨域配置</span><br><span class="line"> * Created by macro on 2019/7/27.</span><br><span class="line"> */</span><br><span class="line">@Configuration</span><br><span class="line">public class GlobalCorsConfig &#123;</span><br><span class="line"></span><br><span class="line">    /**</span><br><span class="line">     * 允许跨域调用的过滤器</span><br><span class="line">     */</span><br><span class="line">    @Bean</span><br><span class="line">    public CorsFilter corsFilter() &#123;</span><br><span class="line">        CorsConfiguration config = new CorsConfiguration();</span><br><span class="line">        //允许所有域名进行跨域调用</span><br><span class="line">        config.addAllowedOrigin(&quot;*&quot;);</span><br><span class="line">        //允许跨越发送cookie</span><br><span class="line">        config.setAllowCredentials(true);</span><br><span class="line">        //放行全部原始头信息</span><br><span class="line">        config.addAllowedHeader(&quot;*&quot;);</span><br><span class="line">        //允许所有请求方法跨域调用</span><br><span class="line">        config.addAllowedMethod(&quot;*&quot;);</span><br><span class="line">        UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();</span><br><span class="line">        source.registerCorsConfiguration(&quot;/**&quot;, config);</span><br><span class="line">        return new CorsFilter(source);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line"></span><br></pre></td></tr></table></figure>

<h3 id="重新运行代码，点击登录按钮"><a href="#重新运行代码，点击登录按钮" class="headerlink" title="# 重新运行代码，点击登录按钮"></a><a target="_blank" rel="noopener" href="https://www.macrozheng.com/mall/technology/springboot_cors.html#%E9%87%8D%E6%96%B0%E8%BF%90%E8%A1%8C%E4%BB%A3%E7%A0%81-%E7%82%B9%E5%87%BB%E7%99%BB%E5%BD%95%E6%8C%89%E9%92%AE">#</a> 重新运行代码，点击登录按钮</h3><blockquote>
<p>发现需要登录认证的&#x2F;admin&#x2F;info 接口的 OPTIONS 请求无法通过认证，那是因为复杂的跨越请求需要先进行一次 OPTIONS 请求进行预检，我们的应用整合了 SpringSecurity，对 OPTIONS 请求并没有放开登录认证。</p>
</blockquote>
<p><img src="https://qiniu.ko25891wan.top/%E6%97%A5%E8%AE%B0%E8%BD%AF%E4%BB%B6/obsition/2024-02-02_22:56:27_tech_screen_30-834faa38.png"> <img src="https://qiniu.ko25891wan.top/%E6%97%A5%E8%AE%B0%E8%BD%AF%E4%BB%B6/obsition/2024-02-02_22:56:27_tech_screen_31-3bb9e2bf.png"></p>
<h3 id="设置-SpringSecurity-允许-OPTIONS-请求访问"><a href="#设置-SpringSecurity-允许-OPTIONS-请求访问" class="headerlink" title="# 设置 SpringSecurity 允许 OPTIONS 请求访问"></a><a target="_blank" rel="noopener" href="https://www.macrozheng.com/mall/technology/springboot_cors.html#%E8%AE%BE%E7%BD%AEspringsecurity%E5%85%81%E8%AE%B8options%E8%AF%B7%E6%B1%82%E8%AE%BF%E9%97%AE">#</a> 设置 SpringSecurity 允许 OPTIONS 请求访问</h3><blockquote>
<p>在 SecurityConfig 类的 configure (HttpSecurity httpSecurity)方法中添加如下代码。</p>
</blockquote>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">.antMatchers(HttpMethod.OPTIONS)//跨域请求会先进行一次options请求</span><br><span class="line">.permitAll()</span><br></pre></td></tr></table></figure>
<p><img src="https://qiniu.ko25891wan.top/%E6%97%A5%E8%AE%B0%E8%BD%AF%E4%BB%B6/obsition/2024-02-02_22:59:29_20240202225928.png" alt="image.png"></p>
<h3 id="重新运行代码，点击登录按钮-1"><a href="#重新运行代码，点击登录按钮-1" class="headerlink" title="# 重新运行代码，点击登录按钮"></a><a target="_blank" rel="noopener" href="https://www.macrozheng.com/mall/technology/springboot_cors.html#%E9%87%8D%E6%96%B0%E8%BF%90%E8%A1%8C%E4%BB%A3%E7%A0%81-%E7%82%B9%E5%87%BB%E7%99%BB%E5%BD%95%E6%8C%89%E9%92%AE-1">#</a> 重新运行代码，点击登录按钮</h3><blockquote>
<p>发现已经可以正常访问。</p>
</blockquote>
<p><img src="https://qiniu.ko25891wan.top/%E6%97%A5%E8%AE%B0%E8%BD%AF%E4%BB%B6/obsition/2024-02-02_22:56:27_tech_screen_33-19a3fb89.png"> <img src="https://qiniu.ko25891wan.top/%E6%97%A5%E8%AE%B0%E8%BD%AF%E4%BB%B6/obsition/2024-02-02_22:59:48_2024-02-02_22:59:40_20240202225938.png"></p>
<h2 id="一次完整的跨域请求"><a href="#一次完整的跨域请求" class="headerlink" title="# 一次完整的跨域请求"></a><a target="_blank" rel="noopener" href="https://www.macrozheng.com/mall/technology/springboot_cors.html#%E4%B8%80%E6%AC%A1%E5%AE%8C%E6%95%B4%E7%9A%84%E8%B7%A8%E5%9F%9F%E8%AF%B7%E6%B1%82">#</a> 一次完整的跨域请求</h2><h3 id="先发起一次-OPTIONS-请求进行预检"><a href="#先发起一次-OPTIONS-请求进行预检" class="headerlink" title="# 先发起一次 OPTIONS 请求进行预检"></a><a target="_blank" rel="noopener" href="https://www.macrozheng.com/mall/technology/springboot_cors.html#%E5%85%88%E5%8F%91%E8%B5%B7%E4%B8%80%E6%AC%A1options%E8%AF%B7%E6%B1%82%E8%BF%9B%E8%A1%8C%E9%A2%84%E6%A3%80">#</a> 先发起一次 OPTIONS 请求进行预检</h3><ul>
<li>请求头信息：</li>
</ul>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line">Access-Control-Request-Headers: content-type</span><br><span class="line">Access-Control-Request-Method: POST</span><br><span class="line">Origin: http://localhost:8090</span><br><span class="line">Referer: http://localhost:8090/</span><br><span class="line">User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.142 Safari/537.36</span><br></pre></td></tr></table></figure>

<ul>
<li>响应头信息：</li>
</ul>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br></pre></td><td class="code"><pre><span class="line">Access-Control-Allow-Credentials: true</span><br><span class="line">Access-Control-Allow-Headers: content-type</span><br><span class="line">Access-Control-Allow-Methods: POST</span><br><span class="line">Access-Control-Allow-Origin: http://localhost:8090</span><br><span class="line">Cache-Control: no-cache, no-store, max-age=0, must-revalidate</span><br><span class="line">Content-Length: 0</span><br><span class="line">Date: Sat, 27 Jul 2019 13:40:32 GMT</span><br><span class="line">Expires: 0</span><br><span class="line">Pragma: no-cache</span><br><span class="line">Vary: Origin, Access-Control-Request-Method, Access-Control-Request-Headers</span><br><span class="line">X-Content-Type-Options: nosniff</span><br><span class="line">X-Frame-Options: DENY</span><br><span class="line">X-XSS-Protection: 1; mode=block</span><br></pre></td></tr></table></figure>

<ul>
<li>请求成功返回状态码为 200</li>
</ul>
<h3 id="发起真实的跨域请求"><a href="#发起真实的跨域请求" class="headerlink" title="# 发起真实的跨域请求"></a><a target="_blank" rel="noopener" href="https://www.macrozheng.com/mall/technology/springboot_cors.html#%E5%8F%91%E8%B5%B7%E7%9C%9F%E5%AE%9E%E7%9A%84%E8%B7%A8%E5%9F%9F%E8%AF%B7%E6%B1%82">#</a> 发起真实的跨域请求</h3><ul>
<li>请求头信息：</li>
</ul>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line">Accept: application/json, text/plain, */*</span><br><span class="line">Content-Type: application/json;charset=UTF-8</span><br><span class="line">Origin: http://localhost:8090</span><br><span class="line">Referer: http://localhost:8090/</span><br><span class="line">User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.142 Safari/537.36</span><br><span class="line">&#123;username: &quot;admin&quot;, password: &quot;123456&quot;&#125;</span><br><span class="line">password: &quot;123456&quot;</span><br><span class="line">username: &quot;admin&quot;</span><br></pre></td></tr></table></figure>

<ul>
<li>响应头信息：</li>
</ul>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br></pre></td><td class="code"><pre><span class="line">Access-Control-Allow-Credentials: true</span><br><span class="line">Access-Control-Allow-Origin: http://localhost:8090</span><br><span class="line">Cache-Control: no-cache, no-store, max-age=0, must-revalidate</span><br><span class="line">Content-Type: application/json;charset=UTF-8</span><br><span class="line">Date: Sat, 27 Jul 2019 13:40:32 GMT</span><br><span class="line">Expires: 0</span><br><span class="line">Pragma: no-cache</span><br><span class="line">Transfer-Encoding: chunked</span><br><span class="line">Vary: Origin, Access-Control-Request-Method, Access-Control-Request-Headers</span><br><span class="line">X-Content-Type-Options: nosniff</span><br><span class="line">X-Frame-Options: DENY</span><br><span class="line">X-XSS-Protection: 1; mode=block</span><br></pre></td></tr></table></figure>

<ul>
<li>请求成功返回状态码为 200</li>
</ul>
<h2 id="项目源码地址"><a href="#项目源码地址" class="headerlink" title="# 项目源码地址"></a><a target="_blank" rel="noopener" href="https://www.macrozheng.com/mall/technology/springboot_cors.html#%E9%A1%B9%E7%9B%AE%E6%BA%90%E7%A0%81%E5%9C%B0%E5%9D%80">#</a> 项目源码地址</h2><p><a target="_blank" rel="noopener" href="https://github.com/macrozheng/mall">https://github.com/macrozheng/mall</a></p>
</article><div class="post-copyright"><div class="post-copyright__author"><span class="post-copyright-meta"><i class="fas fa-circle-user fa-fw"></i>文章作者: </span><span class="post-copyright-info"><a href="https://ko25891wan.gitlab.io">十一星野</a></span></div><div class="post-copyright__type"><span class="post-copyright-meta"><i class="fas fa-square-arrow-up-right fa-fw"></i>文章链接: </span><span class="post-copyright-info"><a href="https://ko25891wan.gitlab.io/2024/01/46a092d5c431.html">https://ko25891wan.gitlab.io/2024/01/46a092d5c431.html</a></span></div><div class="post-copyright__notice"><span class="post-copyright-meta"><i class="fas fa-circle-exclamation fa-fw"></i>版权声明: </span><span class="post-copyright-info">本博客所有文章除特别声明外，均采用 <a href="https://creativecommons.org/licenses/by-nc-sa/4.0/" target="_blank">CC BY-NC-SA 4.0</a> 许可协议。转载请注明来自 <a href="https://ko25891wan.gitlab.io" target="_blank">小小程序员</a>！</span></div></div><div class="tag_share"><div class="post-meta__tag-list"></div><div 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style="color: #24292e;"></i></a><a class="social-icon" href="mailto:ko25891wan@outlook.com" target="_blank" title="Email"><i class="fas fa-envelope" style="color: #4a7dbe;"></i></a></div></div><div class="card-widget card-announcement"><div class="item-headline"><i class="fas fa-bullhorn fa-shake"></i><span>公告</span></div><div class="announcement_content">This is my Blog</div></div><div class="sticky_layout"><div class="card-widget" id="card-toc"><div class="item-headline"><i class="fas fa-stream"></i><span>目录</span><span class="toc-percentage"></span></div><div class="toc-content"><ol class="toc"><li class="toc-item toc-level-2"><a class="toc-link" href="#%F0%9F%91%8D-%E7%9B%B8%E5%85%B3%E8%A7%86%E9%A2%91%E6%95%99%E7%A8%8B"><span class="toc-number">1.</span> <span class="toc-text"> 👍 相关视频教程</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#%E4%BB%80%E4%B9%88%E6%98%AF%E8%B7%A8%E5%9F%9F%E9%97%AE%E9%A2%98"><span class="toc-number">2.</span> <span class="toc-text"> 什么是跨域问题</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#%E8%B7%A8%E5%9F%9F%E9%97%AE%E9%A2%98%E6%BC%94%E7%A4%BA%E5%8F%8A%E8%A7%A3%E5%86%B3"><span class="toc-number">3.</span> <span class="toc-text"> 跨域问题演示及解决</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#%E7%82%B9%E5%87%BB%E5%89%8D%E7%AB%AF%E7%99%BB%E5%BD%95%E6%8C%89%E9%92%AE"><span class="toc-number">3.1.</span> <span class="toc-text"> 点击前端登录按钮</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#%E8%A6%86%E7%9B%96%E9%BB%98%E8%AE%A4%E7%9A%84-CorsFilter-%E6%9D%A5%E8%A7%A3%E5%86%B3%E8%AF%A5%E9%97%AE%E9%A2%98"><span class="toc-number">3.2.</span> <span class="toc-text"> 覆盖默认的 CorsFilter 来解决该问题</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#%E9%87%8D%E6%96%B0%E8%BF%90%E8%A1%8C%E4%BB%A3%E7%A0%81%EF%BC%8C%E7%82%B9%E5%87%BB%E7%99%BB%E5%BD%95%E6%8C%89%E9%92%AE"><span class="toc-number">3.3.</span> <span class="toc-text"> 重新运行代码，点击登录按钮</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#%E8%AE%BE%E7%BD%AE-SpringSecurity-%E5%85%81%E8%AE%B8-OPTIONS-%E8%AF%B7%E6%B1%82%E8%AE%BF%E9%97%AE"><span class="toc-number">3.4.</span> <span class="toc-text"> 设置 SpringSecurity 允许 OPTIONS 请求访问</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#%E9%87%8D%E6%96%B0%E8%BF%90%E8%A1%8C%E4%BB%A3%E7%A0%81%EF%BC%8C%E7%82%B9%E5%87%BB%E7%99%BB%E5%BD%95%E6%8C%89%E9%92%AE-1"><span class="toc-number">3.5.</span> <span class="toc-text"> 重新运行代码，点击登录按钮</span></a></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#%E4%B8%80%E6%AC%A1%E5%AE%8C%E6%95%B4%E7%9A%84%E8%B7%A8%E5%9F%9F%E8%AF%B7%E6%B1%82"><span class="toc-number">4.</span> <span class="toc-text"> 一次完整的跨域请求</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#%E5%85%88%E5%8F%91%E8%B5%B7%E4%B8%80%E6%AC%A1-OPTIONS-%E8%AF%B7%E6%B1%82%E8%BF%9B%E8%A1%8C%E9%A2%84%E6%A3%80"><span class="toc-number">4.1.</span> <span class="toc-text"> 先发起一次 OPTIONS 请求进行预检</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#%E5%8F%91%E8%B5%B7%E7%9C%9F%E5%AE%9E%E7%9A%84%E8%B7%A8%E5%9F%9F%E8%AF%B7%E6%B1%82"><span class="toc-number">4.2.</span> <span class="toc-text"> 发起真实的跨域请求</span></a></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#%E9%A1%B9%E7%9B%AE%E6%BA%90%E7%A0%81%E5%9C%B0%E5%9D%80"><span class="toc-number">5.</span> <span class="toc-text"> 项目源码地址</span></a></li></ol></div></div><div class="card-widget card-recent-post"><div class="item-headline"><i class="fas fa-history"></i><span>最新文章</span></div><div class="aside-list"><div class="aside-list-item no-cover"><div class="content"><a class="title" href="/2024/02/c60470b9a892.html" title="Java集合使用注意事项总结">Java集合使用注意事项总结</a><time datetime="2024-02-03T04:58:22.000Z" title="发表于 2024-02-03 12:58:22">2024-02-03</time></div></div><div class="aside-list-item no-cover"><div 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